Printing telegraph apparatus



Sept 14, 1943- J. w. LONG Erm.

PRINTING TELEGRAPH APPRA'US 2 sheets-sheet i Filed June 14, 1941 vINVEN-roRs J. w. 1.o NG

G. I. ROBERTS BY z ATTORNEY v septw 14, 1943;

J. w. LONG Err AL PRINTING TELEGRAPH APPARATUS Filed Junev 14, 1.941 2Sheets-Sheet 2 J. W. LONG G. 1. ROBERTS E* fr 27M ATTORNEY V PatentedSept. 14, 1943 PRINTING TELEGRAPH APPARATUS James W. Long, Plainfield,and George I. Roberts, Maywood, N. J., assignors to The Western UnionTelegraph Company, New York, N. Y., a corporation of New YorkApplication June 14, 1941, Serial No. 398,100

14 Claims.

This invention relates primarily to printing telegraph apparatus andmore particularly to an improved and novel typewheel shiftingarrangement for use primarily on and in conjunction with a telegraphprinter such as that disclosed in a copending application of J. W. Longand G. I. Roberts, led September 13, 1938, Serial No. 229.672, nowPatent No. 2,281,775, granted May 5, 1942. Although the invention isshown in the drawings and hereinafter described as being employed on theabove mentioned printer, it will be obvious that the principles thereofmay be applied to various other printers.

The above mentioned application discloses a telegraph page printeremploying a typewheel in the printing unit. The axis of the typewheel isdisposed in a substantially vertical position and has fourcircumferential rows of type elements thereon. The typewheel moves backand forth relative to the recording paper to effect letter spacing andreturn thereof for a new line of print and, in addition, is movedaxially to place any one of the four rows of type elements thereon inprinting position. The present invention relates to the axial movementof the typewheel whereby any one of the plurality of circumferentialrows is selectively positioned in a printing position opposite therecording platen.

In view of the above, it is one of the primary objects of the presentinvention to provide a typewheel elevating or axially shifting mechanismof improved design embodying fewer parts requiring less maintenance andadjustments, easier to manufacture, quieter in operation, and capable ofhigh speed operation.

The typewheel of the above mentioned printer is axially shifted to bringany one of the four circumferential rows opposite the printing platenunder the control of shift and unshift signals in conjunction with oneof the impulses of each character code group. The shift and unshiftsignals determine from which of two circumferential rows on thetypewheel following characters will be selected while the followingcharacter code groups select one of these two rows and a particularcharacter thereon. the typewheel from one of its extreme positions tothe other requires a considerable amount of work and where such anoperation is performed in a single movement a considerable load isimposed upon the operating mechanism and in connection with the above itis another object of the invention to provide means whereby the axialshifting of the typewheel from one extreme posi- To shift y tion to theother is effected in steps and not in a single operation.

The above and other objects of the invention will be more apparent whentaken in conjunction with the following detailed description thereof andthe accompanying drawings, in the latter of which:

Fig. 1 is a perspective view of the telegraph printer disclosed in theabove mentioned Long et al. application with the present inventionembodied thereon;

Fig. 2 is a perspective view showing the elcments of the presentinvention and the manner in which they cooperate with certain of theelements of the above mentioned printer;

Fig. 3 is an elevational view showing principally the-typewheel and theelevating mechanism therefor;

Fig. 4 is an elevational view showing a part of the control mechanismemployed in controlling the elevation of the typewheel; and

Fig. 5 is a detailed view showing a part of the function operatingmechanism of the printer.

The above mentioned printer is controlled by start-stop or simplex typeof signals and as well known in the art, such signals comprise a startimpulse of uniform line condition followed by a definite number, usuallyve, of character or code impulses' in various permutations which are inturn followed by a rest impulse. When five code impulses of either oneline condition or another are employed, thirty-two possible combinationsare available and in order to increase the number of availablecharacters that may be recorded, case grouping of the signals isresorted to. The case determining signals, sometimes called shift andunshift signals, condition the printer so that depending upon which ofthe shift signals'has been transmitted, either one or the other of twodifferent characters will be recorded in response to the same charactergroup. In this way the number of available characters may be increasedor almost doubled.

Referring to Fig. 1 the printing unit comprises a typewheel II havingfour circumferential rows of type elements thereon. The typewheel isseing platen I3 as guided on rods I5 and I6. -The movement of thecarriage I4 to the right in a letterV spacing direction is effected byracks I1 engaging pawls (not shown) on the carriage. The disengagementof the pawls with the racks I1 allows a spring drum I8 to return thecarriage for the beginning of'a new line of print. Printing from thetypewheel II after it has been selectively positioned both axially androtatively is effected by rocking the same so as to force an inkingribbon I9 against the recording paper or blank 2I. A completedescription of the typewheel and its associated elements is given in theabove mentioned copending application and reference may be had theretofor a complete and detailed description of the whole printer.

On the receipt of a code group of impulses, a set of selectors (notshown) equal in number to the number of intelligence impulses in a codegroup, are selectively positioned into one or the other of two positionsand thereafter the setting of the selectors is transferred to a set oftransfer bars 22, Fig. 2. The transfer bars 22 are guided for movementin the direction of their length on a. stud 23 and other guiding meansnot shown, and assume either one or the other of two positions inaccordance with the setting transferred thereto from the selectors. Thetransfer bars 22 through depending arms 24 control a stop unit device(not shownlwhich determines the rotative position of the typewheel. Inaddition to the above the transfer bars 22 by means of notches such as26 arranged on both the upper and lower sides thereof control various ofthe printer functions such as shift-and unshift, line feed and carriagereturn. Associated with the transfer bars 22 in operative relation withthe notches 26 are a series of pivot levers such as 21, 28 and 29 whichcooperate with the notches in such a manner that for predeterminedsettings of the transfer bars 22 the pivot levers are permitted to entera row of aligned notches or to be selectively operated. The pivot levers21, 28 and 29 are pivotally mounted at their rear ends on a pivot rod 3|and the levers 28 and 29 have springs such as 32 which tend to force thesame into the notches.v

Associated with the left hand end of the pivot levers 28 and 29 areindividual slide bar s 33 and 34. Springs such as 36 tend to slide theslide bars 33 and 34 toward the right and hold the right hand endsthereof in abutting engagement with the left hand ends of associatedpivot levers. The slide bars 33 and 34 are suitably guided forlongitudinal movement in guides not shown. When one of the pivot levers28 or 29 is allowed to enter a row of aligned notches in the transferbars 22, the left hand end is moved downward and out of blockingengagement with the right hand end of the associated slide bar whereuponthe slide bar is free to move a predetermined distance to the rightunder the action of its attached spring 36. The movement of the slidebar from its normal left hand position to a` selected right handposition determines whether or not certain of the printer functions willbe performed on or during associated cycles of operation. The manner inwhich the slide bars 33 and 34 control the performance of certain of theprinter functions will be described in the following paragraph.

Located in the printeris a constantly rotating shaft 31 and arranged tobe clutched to the shaft for one revolution at a time in conjunctionwith the receipt of each code group of impulses is a f sleeve 38.Located on the sleeve 38 and adapted to rotate therewith are a series ofcams among which are included an elevating cam 39, a sliding baroperating cam 48, Fig. 4, and a oating lever operating cam 4I, Fig. 5.In operative relation with the periphery of the sliding bar operatingcam 48, Fig. 4, is a cam follower 42, located on the upper end of anupwardly extending arm of a bell crank 43. The bell crank 43 ispivotally mounted on a pin 44 supported in a bracket 46 attached to thebase plate 41 of the printer. The

r ments to cause the sliding bar 6I 69 move together.

leftwardly extending arm 48 of the bell crank 43 carries therein aninverted screw 43. the head of which is in operative relation'with aroller 5I carried in the rightwardly extending arm 52 of a bell crank53, Fig. 2. The bell crank 53 is pivotally mounted on a pivot pin 54extending horizontally from a bracket member 56 and has an upwardlyextending arm 51 positioned in the rear of a roller 58 located on a pin58 in .a sliding bar 6I. g

The sliding bar 6I `isiguided for longitudinal movement in blocks suchas either endv which are supported in the upper part of the bracket'membe'rggi A spring-.Slis attached tothe sliding bar Btjbymeans of aln64 and has the other end anchored on a pinf66 extending from vthebracket 56. The spring 63 tends to slide the sliding bar 6I toward therear of the printer but is only permitted to do so at predeterminedtimes.

The sliding bar operating cam 40 is shown in its normal rest position inFig. 4 and shortly after the sleeve 38 starts to rotate, the follower42` is allowed to enter the notch in the cam whereupon if the slidingbar 6I is not blocked by other meanathe spring 63 is allowed to move thesame an amount limited by the depth of the notch in the cam 48 towardthe rear of the printer. The bell cranks 43 and 53 thus control themovement of the sliding bar at the beginning of its movement and nearthe end of a revolution of the cam 40 it operates the bell cranks 53 and43 and the above described eleto move forward back into'its normalposition.

Secured to the rear end of the sliding bar 6I is an upwardly projectingmember 61 which has a rightwardly extending finger 68. The finger 68cooperates with the right hand end of a lever 69 pivoted at its lefthand end on 1I A link 12 is pivotally attached to the center ofthe'lever`69 and to the forward end of the pivot lever 21 so that thepivot lever 21 and lever A spring 13 attached to the lever 69 tends topivot the same in a downward direction and holds the pivot lever 21 inengagement with the transfer bars 22. It will be noted that the pivotlever 21 has a recessed portion or notch 10 therein extending over thefirst four of the transfer bars 22 and accordingly its pivoting iscontrolled solely by the rearmost one of the transfer bars. 'I'hus withthe rearmost transfer bar 22 in one position, the pivot lever 21 is heldin its elevated position Whereas with the same transfer bar in itsoppositeposition, the pivot lever 21 enters the notch in the bar andpivots in a downward direction. Thus only the rearmost one of thetransfer bars 22 controls the pivoting of the pivot lever 21.

When the pivot lever 21 is held in its upper position, the link 12attached thereto pivots the lever 68 to place the free end thereof inthe path of thefinger 68 on the member 61 at the right hand end of thesliding bar 8|.

62 located adjacent a pivot pin' There is little clearance between thefinger 68 and the end of the lever 69 and therefore with the lever inthe path of the finger 68, the spring 63 attached to the sliding bar iscapable of moving the same as controlled by the cam 40 only a slightdistance before it is blocked by the lever 69. However, when the pivotlever'21 enters the notch in the rearmost transfer bar 22, the lever 69is plvoted downward to remove the end from the path of movement of thefinger 68 and hence with the lever 69 in this position, the movement ofthe sliding bar 6| is not blocked and it is therefore allowedA to slideto the rear an amount determined by the depth of the notch in the cam40. Thus, depending upon the position of the rearmost transfer bar 22,the sliding bar 6| is allowed to move to the rear only a small amount oran appreciable amount. The two positions of the sliding bar 6|determines in a manner hereinafter described whether printing will beeffected from one or the other of two circumferential rows of typeelements on the typewheel Figs. 1 and 3.

The functions of the printer are controlled by a set of socalledfloating levers, one of which, the shift control floating member 16, isshown in full in Fig. 2, whereas only a fragmentary part of the righthand ends of the other floating levers 11 are shown. The right hand endsof the floating levers 16 and 11 are pivotally carried on a pivot pin 18secured in the upper end of a yoke member 19. Secured to the yoke 19 isan operating rod 8| which has attached to its lower end a U- shapedmember 82. The U-shaped member 82 carries a pivot pin 83 by means ofwhich the member 82 is pivotally connected to the right hand end of alever 84, Fig. 5. The lever 84 is pivotally supported on a screw 86 atits left hand end and carries adjacent the center a cam follower 81. Thecam follower 81 is in operative relation with the cam 4| on the sleeve38 and is held in engagement therewith by a spring 88 attached to thelever 84.

The cam 4I is shown in its normal rest position in Fig. 5 and duringeach revolution of the cam sleeve 38 the cam 4| causes the lever 84 topivot in a clockwise direction after which the spring 88 pivots it backto its normal position in a counter-clockwise direction. The operationof the lever 84 is timed with respect to the operation of the slidingbar 6| as controlled by the sliding bar operating cam 40 so as to occurlater in the cycle.

The shift control floating lever 16 is the only one that enters into thecontrol of the mechanism including the present invention and in order tosimplify the drawings only this oating member is shown in full. The lefthand end of the floating lever 16 rests on a stop 15 and has pivotallyattached thereto and ldepending therefrom a link 89, the lower end ofwhich is pivotally attached to the free end of a clam-ping arm 9|clamped to the rear end Iof a pivot rod 92. The pivot rod 92 is suitablysupported in brackets (not shown) and has clamped thereto for pivotingmovement therewith adjacent the forwardr end a depending arm 93 and arightwardly extending arm 94.

Attached to the lower end of the arm 93 by means of a shoulder screw 96is a rightwardly extending lever 91. Secured to the right hand end ofthe lever 91 is a hooked member`98. A bracket 99fwith a vertical slot|0| therein guides the hooked member 98. A spring |02 attached to thelever 91 and anchored in a bracket |03 tends to move ther lever 91toward the right and pivot lthe rod 92 in a counter-clockwise directionas limited by the engagement of the floating lever 16 with the stop 15.A second spring |04 attached to the lever 91 and also anchored in thebracket |03 tends to elevate the right hand end of the lever 91 andhooked member 98 to hold the latter vagainst the bottom of the slot 0|in the bracket 99.

The rightwardly extending arm 94 attached to the rod 92 has on the righthand end thereof a shoe |06. The shoe |06 is located above and invertical alignment with a roller |01 pivotally carrled on the end of aleftwardly extending arm |08 of a lever |09. The lever |09 is pivotallymounted adjacent its center on a shoulder screw carried in the end ofthe leftwardly and vupwardly extending arm ||2 of the bracket |03. Theend of the right hand arm 3 of the lever |09 extends over the upper endof a latch lever ||4. The latch ||4 is pivotally mounted on a shoulderscrew ||6 carried in a bracket ||1 secured to the bracket |03. A spring||8 attached to the latch I4 normally tends to pivot the same in acounterclockwise direction and normally holds the latch ||4 against anadjustable limiting stop |19. The latch |4 is disposed in asubstantially vertical position and the depending arm |2| thereof is inoperative relation with the hooked portion |22 on the hooked member 98.

Located on the arm I3 of the lever |09 is a shoulder screw |23 uponwhich is pivoted at its right hand end an elevator lever |24. Adjacentthe center of the elevator lever |24 is a stud |26 which carries aroller cam follower |21 in operative alignment with the elevator cam 39.The left hand end of the elevator lever has a depending member |28attached thereto. Attached to the member |28 is a flexible ribbon |29adapted to wind about a spring drum |3|. 'I'he spring drum |3| ispivotally mounted on a shoulder screw |32 and, by virtue of the springcontained therein, tends to rotate the drum |3| in a counterclockwisedirection to wind the ribbonA |29 thereabout and thus elevate theelevator lever |24. Thespring drum |3| tending to elevatethe lever|24-holds the cam follower |21 in engagement with the periphery of theelevator cam 39 and, if the lever |24 is not prevented from pivoting bymeans hereinafter described, the same is allowed to rise as controlledby the cam 39. Some time later in the cycle of the cam 39 the high partthereof engages the follower |21 to depress the lever |24 and move thesame back into its normal position. Thus, during each operating `cycleof the printer, the elevator lever tends to rise an amount limited bythe depth of the notch in the cam 39, after which it is depressed backinto its normal -position. The above operation of the elevator lever |24occurs in timed relation to the operations of the other mechanisms.

Extending horizontally from adjacent the center of the member |28 at theleft hand end of the elevator lever |24 is a stud |33 which carries onits forward end a roller |34. The roller |34 is positioned ybeneath abracket member |36 attached to the back of an elevator bar |31, Figs. 1and3. yThe elevator bar |31 is disposed in a horizontal position andpivotally attached thereto are two similar arms |38. The other ends ofthe arms |38 are pivotally supported on shoulder screws |39 in a bracket|4I secured to the base 41. Thus, as the elevator bar |31 moves in amanner hereinafter set forth, it at all times remains horizontal. Aspring |40, Fig. 2, is attached to the bracket member |86 vand to antions, the spring |42 returns the elevator bar |31 back to its normalposition.

The lower end of the typewheel shaft i2 is posltioned a slight distanceabove the upper surface of the elevator bar |31 and elevation of thesaid bar engages vthe typewheel' shaft to elevate the same therewith.The typewheel shaft I2 is carried on the carriage I4 in such a mannerthat it is capable of being moved axially while at the same timemaintaining the correct angular Arelation with the stop unit (notshown). After the typewheel shaft is elevated in accordance with theamount of movement of the elevator bar |31, it is latched in itselevated position by latching means (not shown) and some time thereafterrocked to effect the printing operation. Some time after the printingoperation in timed relation to the various other operations, thetypewheel shaft is unlatched and permitted to drop to the extent limitedby the elevator bar |31. Thus, the elevator bar |31 is effective toelevate the typewheel shaft I2 and the typewheel I| to piace any one ofthe four rows of type elements thereon in printing position. The mannerin which the elevator bar I 31 is controlled to elevate the typewheelinto any one of its plurality of positions will be set forth infollowing paragraphs.

Located adjacent the center of the shift control floating lever 16 aretwo depending fingers |42 and |43, with the finger |43 being Slightlylonger than the finger |42. The fingers |42 and |43 are located directlyabove associated slide bars 33 and 34, respectively. The slide bar 33has an upwardly extending finger |44 and the slide bar 34 an upwardlyextending finger |46. With the slide bars 33 and 34 in their normalposition, as held by the ends of associated pivot members 28 and 29,respectively, the fingers |44 and |46 are out of' alignment withassociated fingers |42 and |43 on 'the floating lever 16. The movementof the slide bar 34 from its normal forward position to its selectedposition by the selective operation of an associated pivot lever 29places the finger |46 beneath the associated finger |43. Similarly, themovement of the slide bar 33 to a selected position places the finger|44 beneath the associated finger |42 on the fioating lever 16.

As hereinbefore described, the right hand ends of the floating levers 16and 11 move in a downward direction during each cycle of operation. ofthe printer and normally pivot idly about their left hand ends. Thefloating levers control the functions of the printer, and when aparticular function is to be performed, a slide bar is se-` detail, theother functions being selectively performed in much the same manner.

With the elevator lever |24 in the position as shown in Fig. 2, theprinter is conditioned in its so-called unshift position and in such aposition is capable of printing letters. In this position the free endof the arm ||3 of the lever |09 rests upon the upper end of the latch||4. With the printer in its unshift position, the conditioning thereofto its shift position is controlled by the slide bar 33. The selectionof the slide bar 33 places the finger |44 thereon beneath the finger I42 on the shift control fioating lever 16.

and when the right hand ends of the floating levers are subsequentlymoved in a downward direction, the finger |42 engages' the finger |44.An appreciable amount of movement in the right hand ends of the floatinglever 16 is required before the finger |42 thereon engages the nger |44,and up to this time the floating lever pivots idly about its left handend. When the finger |42 engages the finger |44, the end of the finger42 serves as a pivot point to cause the elevation of the left hand endof the floating lever 16 and its attached link 89. This upward movementof the link 89 conditions the printer to print figures in a mannerhereinafter pointed out.

In a similar manner the selection of the slide bar 34 places the finger|46 beneath the finger |43 on the floating lever 16 to cause thefloating lever to pivot about the end of the finger |43 and therebyelevate the left hand end. The

finger |43 is somewhat longer than the finger |42, and with the fingers|44 and |46 of substantially equal length the finger 43 will engage thefinger |46 with less movement of the right hand end of the floatinglever 16 than the movement required to engage the finger |42 with thefinger |44. Consequently, the selection of the slide bar 34 causesgreater elevation of the left hand end of the floating lever 16 andattached link 89 than the selection of the slide bar 33. The fact thatthe slide bar 34 is nearer the right hand end of the floating lever 16which moves a' predetermined amount during each cycle than the slide bar33 also is effective to cause greater eleva` tion of the left hand endof the shift control floating lever 16 onthe selection of the slide bar34. Thus, depending upon the selection of either the so-called "iiguresslide bar 33 or the letters slide bar 34, the link 89 is elevated eithera first or a second amount. The manner in which the elevation of thelink 89 these two amounts controis-the printer to record either lettersor figures f will be described hereinafter.

Attached to the forward end of `the sliding bar 6| is an upwardlyprojecting notched member |41 with two notches |48 and |49 therein. The'notches |43 and |49 cooperate with a bracket member |5| attached to theback of the elevator bar |31. With the printer in its letters positionand with the sliding -bar 6| in its forward posi'- tion, the notch |48is positioned a slight amount above the horizontal surface of thebracket'. |5'I,

and accordingly, as the camV 39 rotates to allow the elevator lever |24to rise, the amount of movement thereof is determined by the clearancebetween the notch |48 and the bracket I5 I. The amount of rising of theelevatorl'ever |24 of this condition is relatively small and is notsufficient to engage the elevator bar |31 with the bottom of thetypewheel shaftI I2. Consequently, the typewheel I will remain in itslowermost position' with the upper'row of type elements thereon in4printing relation with the platen I3.

When it is desired to select a character from the second row oi' typeelements from the top of the typewheel, one of the selecting impulses ofeach of such code groups is of such a character that the associated orrearmost one of the transfer bars 22 is positioned to permit the pivotlever 21 to assume its lower position. As herelnbefore described, withthe pivot lever 21 in this position the end of the lever 89 is moved outof blocking relation with the nnger 68 of the sliding bar 8| and,consequently, when the sliding bar subsequently slides to the rear, itis not blocked and is allowed to slide to the rear an amount determinedby the depth of the notch in the slid- 'ing bar operating cam 40. vWhenthe sliding barl 8| is moved to its rearmost position, the notches |48and |49 in the member |41 are out of operative relation with thehorizontal position of the bracket I| and, therefore, do not interferewith the elevation of the elevator bar |31. Thus, when the notch in thecam 39 engages the roller |21 on the elevator bar |24, the spring drum|3| is permitted to elevate the llever |24 and the elevator bar |31 thefull amount determined by the depth of the notch in the cam 39. 'I'hevarious links and levers are so proportioned that this amount ofelevation of the elevator lever |24 places the second peripheral row` oftype elements from the top on the typewheel in printing relation to theplaten I3, the typewheel being latched in its elevated position topermit the return of the elevating mechanism to its normal positionprior to the printing operation. Thus, with the printer in its unshiftor letters position, the character of a predetermined one of theintelligence impulses determines whether or not printing will beeffective from either the first or second peripheral rows of elementsfrom the top on the typewheel With the printer in its unshift or lettersposition as shown in Fig. 2, the selection of the figures slide bar 33conditions the printer to its shift position. As hereinbefore described,the selection of the slide bar 33 causes a first predetermined amount ofpivoting of the shift control floating lever 16 or the, elevation of theleft hand end and the attached link 89 a first predetermined amount. Theelevation of the link 99 through the arm 9| causes the rod 92 to pivotin a clockwise direction. The arm 93 pivoting with the rod 92 causes thelever 91 and hooked member 98 to move toward the left. The movement ofthe hooked member 98 to the left causes the hook |22 thereon to engagethe lower end of the arm- I2| of the latch ||4 to pivot the same in aclockwise direction against the action of its attached spring IIB. 'Ihispivoting of the latch ||4 withdraws the upper end thereof out frombeneath the end of the arm ||3 of the lever |09, whereupon the lever |09is free to pivot in a clockwise direction about the shoulder screw I. Anadjustable eccentric stop |52 on the bracket |03 determines the amountof pivoting of the lever |09 in a clockwise direction while the forcefor pivoting the lever |09 is derived from the spring drum |3| tendingto pivot the elevator' lever |24 in a clockwise direction with theroller |21 thereon engaging the cam 39 serving as a pivot. Thus, whenthe lever |09 pivots from the position shown in Fig. 2, wherein the` endof the arm ||3 rests on the upper end of the latch ||4, into engagementwith the adjustable stop |52, the elevator lever |24 is permitted toypivot a predetermined amount in a clockwise direction.

This pivoting of the elevator lever |24 causes the elevator bar |31 torise an amount substantially equal to that of two consecutive rows oftype on the typewheel and accordingly when the elevator lever |24 isthus pivoted, the typewheel shaft I2 is elevated an amount sufficient toplace the third lrow of type elements from the top in printing relationwith the platen I3. The member |41 does not interfere with the elevationof the elevator bar |31 on the above pivoting of the elevator lever |24as a shift combination is such that upon the selection of the shiftslide bar 33 the sliding bar 6| will be in its rearmost position wherethe notch |48 is out of operative il'elation with the horizontal portionof the bracket During the movement of the member 98 to the left, asabove described, a sloping surface |53 thereon engaging the bottom ofthe bifurcation |0| cams the hooked member 98 downward to disengage thehooked portion |22 thereon from the lower end of the arm |2| shortlyafter the upper end of the latch ||4 has moved out from beneath the freeend of the arm |3. On the disengagement of the hook |22 from the lowerend of the arm |2I, the latch ||4 is pivoted back into its normalposition `against the member ||9 by the spring |8. The movement of thehooked member 98 to the leftduring a shift cycle of operation. stopssoon after the hook |22 is disengaged from the arm |2| after which thereturn of the floating levers to their normal position effects thereturn of the hooked member 98 to its normal position inoperatingrelation with the latch I4.

The nature of the shift code combination is such that during the receiptthereof the sliding bar 6| is moved to the rear and, accordingly, as thecam 39 revolves in the associated cycle, the elevator bar |24 ispermitted to pivot an amount sufilcient to place the lowermost row oftype elements in printing relation with the platen |3. However, printingis blocked during a shift function and, as the cam 39 rotates to itsnormal position, the elevator lever |24 is pivoted in a counterclockwisedirection to permit the elevator bar |31 to be lowered an amountsufficient to place the third row of type elements from the top in theprinting plane. Thus, following the shift code group, the third row oftype elements from the top is placed in printing relation with theprinting platen. With the printer in its shift position, the characterof one of the impulses of each succeeding group controls the sliding bar6| to determine whether or not the elevator lever |24 pivots only aslight amount or the amount permitted by the depth of the natch in thecam 39; With the sliding bar 6| in its forward position, the notch |49engages the bracket |5| to prevent any appreciable pivoting of theelevator lever |24 whereas with the sliding bar 6| in its rearmostposition the lever |24 is permitted to pivot to the full amount of thenotch in the cam 39. Thus, on the receipt of a shift or gures codegroup, the pivot point or shoulder screw |23 of the elevator lever |24is shifted from its upper normal position to its lower position asdetermined by the adjustment of thevstop |52, and this changing of theelevator lever` pivot point places the third row from the top of thetype elements in the printing plane.

The printer is returned to its unshift position from the shift positionby the selection of the letters shift slide bar 34 which, as abovedescribed, causes the pivoting of the shift control floating lever 16and the elevation of the link 89 a second predetermined amount, whichsecond predetermined amount is considerably greater than that effectedduring the shift cycle of operation. During the clockwise pivoting ofthe lever |09 in the above described shift cycle of operation, theroller |01 on the left hand end of the arm |00 is elevated and broughtcloser to the shoe at the right hand end of the arm 94 on the rod 92.vAccordlngly, when the link 99 is elevated the second predeterminedamount in response to the unshift signal, the rod 92 is rotatedclockwise to cause the shoe |06 on thearm 94 to engage the roller |01and pivot the lever |09 in a counterclockwise direction. This pivotingof the lever |09 is sufficient to elevate the free end of the arm ||3above the upper end of the latch ||4 and, as the rod` 92returns to itsnormal position, the arm I I3 is permitted to rest on the top of thelatch. Although the latch ||4 is operated in the same cycle ofoperation, it will have returnedto its normal position in time toengagethe end of the arm ||3. This pivoting of the lever |09 in acounterclockwise direction' elevates the shoulder screw |23 at the righthand end of the elevator bar |24, and during such movement the roller|21 on the lever |24 serving'as a pivot causes said lever to pivot in acounterclockwise direction to effect lowering of the typewheel an amountsufficient to place the uppermost row of type elements in the printingplane. Thus, the printer is positioned in its unshift position and themovement from one shift position to the other consists primarily ofshifting the location of the normal pivot point or shoulder screw |23 ofthe elevator lever |24. 'I'his shifting of the location of the pivotpoint of the lever |24 is determined by the v amount of pivoting of acommon shift control floating lever 16, one amount of pivoting of thelever 16 being effective to shift the location of the pivot point of theelevator lever |24 from a first to a second position, while the secondamount of pivoting of the lever 16 shifts the location of the pivotpoint of the lever |24 from the second to its first position. Thevarious ope-rations of the printer occur in timed relation with respectto one another and effect their associated functions withoutinterference, the timing thereof being fully described in the abovementioned copending application.

It-is obvious, of course, that various modifications of the inventionother than the embodiment shown in the drawings and described herein maybe made without departing from the spirit or essential attributesthereof, and it is desired, therefore, that'only such limitations beplaced thereon as are disclosed by they prior art or are specificallyset forth in the appended claims.

What is claimed is:

1. In a telegraph receiver, an axially movable typewheel with aplurality of circumferential rows of type elements thereon, saidtypewheel normally having either a flrst'or a second predetermined rowof type elements in a printing plane, a cyclically operable functioncontrol lever normally pivotable about a predetermined point, a selectormeans, means controlled by lsaid selector means for selecting otherpivot points for said function control lever, means controlled by saidfunction control lever in pivoting about a first selected pivot pointfor placing the first predetermined `row of said type elements in theprinting plane, and means controlled by said function control lever inpivoting about a second selected pivot point for placing a secondpredetermined row of type elements in the printing plane.

2. In a telegraph receiver selectively controlled .in response toreceived code groups of impulses,

an axially movable typewheel having a plurality of more than twocircumferential rows of type elements thereon, said typewheel beingaxially4 movable to place the rows of type elements thereon in aprinting plane, a cyclically operable a first code'group of impulsesfor'selecting a first selected pivot point for said function controllever whereby the same operates to cause the axial movement of saidtypewheel to place a first predetermined row of said type elements` inthe printing plane, means controlled by said selector mechanism inresponse to a second code group of impulses for selecting a secondselected pivot point for said function control lever whereby the sameoperates to cause the axial movement of said typewheel to place a secondpredetermined row of type elements in the printing plane, and meanscontrolled by said selector mechanism by a part of following code groupsof impulses with the first of said predetermined rows of type elementsin the printing plane for placing a third predetermined row of typeelements in the printing plane.

3. In a telegraph receiver selectively controlled in response toreceived code groups of impulses, an 'axially movable typewheel having aplurality of more than two circumferential rows of type elementsthereon, said typewheel being axially" movable to place said rows ofelements one at a time in a 'printing plane, a cyclically operablefunction control lever normally pivotable about a predetermined point,-a selector means, means controlled by said selector means in responseto a first code group of impulses for selecting a first selected pivotpoint for said function control lever whereby the same operates to causethe axial movement of said typewheel to place a first predetermined rowof said type elements in the printing plane, means controlled by saidselector mechanism in response to a second code group of impulses forselecting a second selected pivot point for said function control leverwhereby the same operates to cause the axial movement of said typewheelto place a second predetermined row of type elements in the printingplane. and means controlled'by said selector mechanism by a part offollowing 'code groups of impulses with the second of said predeterminedrows of type elements in the printing plane for placing a fourthpredetermined row of type elements in the printing plane.

4. In a telegraph receiver selectively controlled in response toreceived code groups of impulses, an axially movable typewheel having aplurality of more than two circumferential rows of type elementsthereon, said typewheel being movable to place said rows of elements oneat a time in a printing plane, a cyclically operable function controllever normally pivotable about a predetermined point, a selector means,means controlled by said selector means in response to a first codegroup of impulses for selecting a first selected pivot point for saidfunction control lever whereby the same operates to cause the axialmovement of said typewheel to place a first predetermined row of saidtype elements in the 'printing plane, means controlled by said selectormechanism in response to a second code group same operates 4to cause theaxial movement of vsaid typewheel to place a-second predetermined row oftype elements in the printing plane, and means including said selectormechanism as controlled by following code groups of impulses with saidfirst row of type elements in the printing plane for placing e. typeelement from said first predetermined row or from a third predeterminedrow in printing position.

5. In a telegraph receiver selectively controlled in response toreceived code groups of impulses, an axially movable typewheel shaft, atypewheel fixed to said shaft and having a, plurality of more than twocircumferential rows of type elements thereon, said typewheel shaftbeing axially movable to place said rows of type elements one at a timein a printing plane, a cyclically operable function control levernormally pivotable about a. predetermined point, a selector means. meanscontrolled by said selector means in response to a first code group ofimpulses for selecting a rst selected pivot point for said functioncontrol lever whereby the same operates to cause the axial movement ofsaid yshaft to place a first predetermined row of saidtype elements inthe printing plane, means controlled by said selector mechanism inresponse to a second code group of vimpulses for selecting a secondselected pivot point for said function control lever whereby the sameoperates to cause the axial movement of said shaft to place a secondpredetermined row of type elements in the printing plane, and meansincluding said selector mechanism as controlled by following code groupsof impulses with said second row of type elements in the printing planefor axially moving said shaft to place a type element from said secondpredetermined row or from a fourth predetermined row in printingposition.

6. In a printing telegraph machine, a typewheel axially movable to placeany one at a time of a plurality of peripheral rows of type elementsthereon' in a printing plane, a cyclically operable cam, a pivotablelever operable by said cam for controlling the axial shifting of saidtypewheel a predetermined distance, selector means, and means includingsaid selector means for shifting the location of the pivot of saidpivotable lever for controlling the axial shifting of said typewheel asecond predetermined distance.

'7. In a printing telegraph machine, a type wheel axially movable toplace any one at a time of a-plurality of peripheral rows of typeelements thereon in a printingplane, a cyclically operable cam, apivotable lever operable by said cam for controlling the axial shiftingof said typewheel a predetermined distance, selector means, meansincluding said selector means for shifting the location of the pivot ofsaid pivotable lever for controlling the axial shifting of saidtypewheel a second predetermined distance, and means including thepivoting of said lever by said cam and the shifting of the location ofthe pivot point thereof for axially shifting said typewheel t place anyone of the peripheral rows of type elements thereon in the printingplane.

8. In a printing `telegraph machine, a typewheel axially movable toplace any one at a time of a plurality of peripheral rows of typeelements thereon in a printing plane, a typewheel shifting mechanismincluding a cyclically operable cam and a pivotable lever, said cambeing effective to pivot said lever to control said typewheel shiftingmechanism to shift said typewheel, a first predetermined amount, andother means for operating said pivotable lever to control said type-Wheel shifting mechanism to shift said typewheel a second predeterminedamount.

9. In a printing telegraph machine, a typewheel axially movable to placeany one at a time of a plurality of peripheral rows of type elementsthereon in a printing plane, a typewheel shifting mechanism including anoperating member, a first and a second operating means for said member,said first and second operating means being adapted to operate saidmember to control said typewheel shifting mechanism to shift saidtypewheel distances of one and two increments respectively, and meansincluding both said first and second operating means for controllingsaid typewheel shifting mechanism to shift said typewheel a distance ofthree increments.

l0. In a printing telegraph machineLa typewheel axially movable to placeany one at a time of a plurality of peripheral rows of type elementsthereon in printing position, an operating member, a selectivelycontrolled means for selecting first and second degrees of operation ofsaid member, means for operating said member the degree determined bysaid selectively controlled means, means .controlled by said member whenoperated said first degree for placing predetermined of said rows oftype elements in printing position, and means controlled by said memberwhen oper.- ated said second degree for placing others of said rows oftype elements in printing position.

11. In a printing telegraph machine, a typewheel axially movable toplace any one at a time of a plurality of peripheral rows of typeelements thereon in printing position, an operating member, a firstselectively controlled means for selecting first and second degrees ofoperation of said member, means for operating said member the degreedetermined by said selectively controlled means, 'means controlled bysaid member when operated said first degree for placing a firstpredetermined one of said rows of type elements in printing position,means controlled by said member when operated said second degree forplacing a second predetermined one of said rows of type elements inprinting position, a second selectively controlled means, and meansincluding said second selectively controlled means and dependent uponthe degree of movement of said operating member for placing third andfourth rows of type elements in printing position.

12. In a telegraph receiver, an axially movable typewheel with aplurality of circumferential rows of type elements thereon, a cyclicallyoperable function control lever normally pivoting a first predeterminedamount, selectively controlled means for causing the pivoting of saidlever second and third predetermined amounts, means controlled by saidlever in pivoting said second predetermined amount for axially movingsaid typewheel to place predetermined of said rows of type elements inthe printing plane, and means controlled by said lever in pivoting saidthird predetermined amount for axially moving said typewheel to placethe others of said rows of type elements in the printing plane.

13. In a telegraph receiver, an axially movable typewheel with aplurality of .circumferential rows of type elements thereon, acyclically operable function control lever normally movable in a. firstpath of movement, selectively controlled means for causing the movementof said'lever in second and third paths of movement, means controlled bysaid lever when moving in said second path of movement for axiallymoving said v typewheel to place a ilrst predetermined row of typeelements in the printing plane, and means controlled by said lever whenmoving in said third path of movement for axially moving said typewheelto place a second predetermined row oi type elements in the printingplane.

14. In a printing telegraph machine, a typewheel axially movable toplace any one at a time of a plurality oi peripheral rows oi' typeelements thereon in a printing plane, a cyclically operable 10 vpivoting member, selectively controlled means 'for changing the pivotpoint of said member from .a normal to either one of the other of twoselect- 5 peripheral rows oi' type elements thereon in the printingplane, and means controlled bysald member with the pivot point thereofat the other one of said selected points for controlling the axialmovement of said typewheel to place the other of said peripheral rows oftype elements in the printing plane.

JAMES W. LONG. GEORGE I. ROBERTS.

